For the first time, Air Architecture presented Yves Klein’s architectural projects and theories,  with particular attention to his idea of "the void" as an immaterial architecture. Relying upon the four elements — air, water, fire, and earth — Klein envisioned a world in which man lives in harmony with the four natural elements through Air Architecture. Famous for his blue-themed monochromes and performances, Klein had a special interest in architecture. With the help of several architects, he designed projects that were never realized, largely due to his premature death at the age of 34.